HP Serveur lame HP ProLiant BL465c Gen8 - Manual (Page 64)

Figure 31 Configuration in which an active mailbox database copy Is backed up and restored
Primary volume 1 is the active mailbox database copy, primary volume 2 is the passive mailbox
database copy, and the secondary volume is managed by the backup server. The active side manages
all the services and backup and restore operations, and the passive side temporarily takes over
execution of the active side's services if needed. The data synchronization between the active side
and the passive side is accomplished via log shipping. On the active side, data is backed up from
primary volume 1 to the secondary volume, and then the data on the secondary volume is stored on
a tape device.
If an error occurs on the active side, the passive side takes over the execution of services. You cannot
perform any backup or restore operations until the active side recovers from the error. After recovery,
seed processing is performed from the passive side, so that the data that was updated while the
passive side executing the services is applied to the active side.
If an error occurs on the passive side, seed processing is performed from the active side, so that the
data on the passive side is restored.
If logical errors, such as those caused by viruses, occur on both the active side and the passive side,
the data is restored from the tape device to the secondary volume, and then from the secondary
volume to primary volume 1. The restored data is then applied to primary volume 2 via seed processing.
Backing up and restoring passive mailbox database copies
The following figure shows an example of a DAG configuration in which a passive mailbox database
copy is backed up and restored.
Application Agent system configurations 64